diff --git a/LICENSE b/LICENSE
index f433b1a53f5b830a205fd2df78e2b34974656c7b..4a2cb1b3ae0cbc3bffac6ef7b398feb219fb3329 100755
--- a/LICENSE
+++ b/LICENSE
@@ -1,3 +1,91 @@
+In the jsapi / util directory, the definitions of some interfaces refer to their definitions in the webapi.
+The following is a reference to the defined interface:
+
+declare namespace util {
+
+    class TextDecoder {
+        /** 
+         * the source encoding's name, lowercased.
+         * @since 7
+         * @sysCap SystemCapability.CCRuntime
+         */
+        readonly encoding: string;
+
+        /** 
+         * Returns `true` if error mode is "fatal", and `false` otherwise.
+         * @since 7
+         * @sysCap SystemCapability.CCRuntime
+         */
+        readonly fatal: boolean;
+
+        /** 
+         * Returns `true` if ignore BOM flag is set, and `false` otherwise.
+         * @since 7
+         * @sysCap SystemCapability.CCRuntime
+         */
+        readonly ignoreBOM = false;
+
+        /** 
+         * the textEncoder constructor.
+         * @param 7
+         * @sysCap SystemCapability.CCRuntime
+         * @param encoding decoding format
+         */
+        constructor(
+            encoding?: string,
+            options?: { fatal?: boolean; ignoreBOM?: boolean },
+        );
+
+        /**
+         * Returns the result of running encoding's decoder.
+         * @since 7
+         * @sysCap SystemCapability.CCRuntime
+         * @param input decoded numbers in accordance with the format
+         * @return return decoded text
+         */
+        decode(input: Uint8Array, options?: { stream?: false }): string;
+    }
+
+    class TextEncoder {
+        /** 
+         * Encoding format.
+         * @since 7
+         * @sysCap SystemCapability.CCRuntime
+         */
+        readonly encoding = "utf-8";
+        
+        /**
+         * the textEncoder constructor.
+         * @since 7
+         * @sysCap SystemCapability.CCRuntime
+         */
+        constructor();
+
+        /**
+         * Returns the result of encoder.
+         * @since 7
+         * @sysCap SystemCapability.CCRuntime
+         * @param The string to be encoded.
+         * @return returns the encoded text.
+         */
+        encode(input?: string): Uint8Array;
+
+        /**
+         * encode string, write the result to dest array.
+         * @since 7
+         * @sysCap SystemCapability.CCRuntime
+         * @param input The string to be encoded.
+         * @param dest decoded numbers in accordance with the format
+         * @return returns Returns the object, where read represents
+         * the number of characters that have been encoded, and written
+         * represents the number of bytes occupied by the encoded characters.
+         */
+        encodeInto(
+            input: string,
+            dest: Uint8Array,
+        ): { read: number; written: number };
+    }
+}
 
                                  Apache License
                            Version 2.0, January 2004
diff --git a/README.md b/README.md
index 2c766ffb6501b275549a84f4f1c5b21eb19fe5c5..63d53a87c5183b71216079852ff1b8f8de483865 100755
--- a/README.md
+++ b/README.md
@@ -1019,3 +1019,6 @@ var result = proc.isWeakSet(new WeakSet());
 
 [base/compileruntime/js_util_module/](base/compileruntime/js_util_module-readme.md)
 
+### License
+
+Util is available under [Mozilla license](https://www.mozilla.org/en-US/MPL/), and the documentation is detailed in [documentation](https://gitee.com/openharmony/js_util_module/blob/master/LICENSE_docs). See [LICENSE](https://gitee.com/openharmony/js_util_module/blob/master/LICENSE) for the full license text.
\ No newline at end of file
diff --git a/README_zh.md b/README_zh.md
index d010d056200966c426556d8ae68a03dffce3d6fc..c659e13c5ed8c58364edede9c41dd9346d9a0030 100644
--- a/README_zh.md
+++ b/README_zh.md
@@ -1020,3 +1020,6 @@ var result = proc.isWeakSet(new WeakSet());
 
 [base/compileruntime/js_util_module/](base/compileruntime/js_util_module-readme.md)
 
+## 许可证
+
+Util在[Mozilla许可证](https://www.mozilla.org/en-US/MPL/)下可用，说明文档详见[说明文档](https://gitee.com/openharmony/js_util_module/blob/master/LICENSE_docs)。有关完整的许可证文本，请参见[许可证](https://gitee.com/openharmony/js_util_module/blob/master/LICENSE)
\ No newline at end of file